Compass



W- S. OVERLIN COMPASS Filed Jan. 10.

Patented Sept. 2, 1924.

UNITED STATES WILLIAM S. OVER/LIN, 0F PORTLAND, OREGON.

COMPASS.

Application filed January 10, 1923.

To all whom it may concern Be it known that I, WILLIAM S. OVERLIN, acitizen of the United States, residing at Portland, in the county ofMultnomah and State of Oregon, have invented new and useful Improvementsin Compasses, of which the following is a specification.

This invention relates to drafting instruments of the compass type, andconsists in a simplified, and otherwise improved compass, by means ofwhich ovals may be described as well as circles. I use the term oval ina general way to include all kinds of cylindrical and conicsections,ellipses, parabolas and hyperbolas.

An instrument for the same purpose is disclosed in the patent toRashkovsky, No. 1,286,770, issued December 3, 1918, in which therelation of the angles ofthe center point and the scribing point, whichresult in the generation by the latter of the various curves, is fullyset forth. It will therefore be suflicient for me to herein refer to thecurves, other than cincles, which can be described by my instrument, asovals, since it is obvious that by changing the said angles, lines ofvarying contour can be drawn.

Broadly stated, the improved instrument, which for trade purposes I callthe ovalgraph, consists of a center pin or axis rod, to the upper end ofwhich are pivoted two divergent legs forming, with said rod, a tripod,whereby the center pin or axis rod can be held at any desired angle tothe plane of the paper or other surface to be inscribed. The markingpoint, pencil or pen, is adjustably clamped to a sleeve or member, whichis free to slide and rotate on the axis rod. the adjustability of thesaid marker being both longitudinal in the clamp and angular aboutthepivot of the clamp on said sleeve.

An embodiment of the invention is illustrated in the accompanyingdrawing, in which,

Figure 1 is an elevation of the instrument, the adjustability of theaxis rod and marker being indicated by dotted lines.

Figure 2 is an elevation at right angles to Figure 1, and

Figure 3 is a cross section on line 3-3, of Figure 1.

In these views, 1 is the center or axis rod, which has a hole drilledthrough its upper end and a collar 2 near its lower, pointed end. Awire, bent into approximately V- Serial No. 611,739.

shape to form divergent legs 3, is passed through the hole in the axisrod, so as to form with it an adjustable tripod, whereby said rod can bemaintained at the desired angle to the surface. A bracket 4 is mountedon the axis rod by means of apertured ears 6, to the upper one of whichis secured a knurled head 7. The body of the bracket is apertured forthe reception of a screw 8, which serves as the pivot, as well as theactuating member, of a clamp 9, in which the marker, shown as a pencil10, is adjustably held.

In using the instrument, the tripod is stood on the paper, or othersurface, with the legs 3 swung at an angle to the rod 1 which will holdthe latter at the desired angle to the surface. The pencil, pen or othermarking implement is adjusted in the clamp 9 at the required length andangle, and then the bracket 4 is rotated about the rod 1 by means of thehead 7. In this way a circle or oval is described on the paper.

Having thus described my invention, what I claim is:

1. A compass comprising a center rod, di vergent supporting legs pivotedto the upper end of said rod, a sleeve freely slidable and rotatable onsaid rod below the point of connection of said legs, and a clamp pivotedon said sleeve and adapted to adjustably hold a marking implement.

2. An instrument for describing circles and ovals, comprising a cent rrod, means to support the same at any desired angle to the surface to beinscribed, a sleeve bracket freely slidable and rotatable on said rod, aclamp for a marking implement, and means for actuating said clamp and atthe same time securing it at any desired angle to said bracket, wherebythe angular positions of both said rod and implement can be varied tocause the latter to describe different curves.

3. A compass comprising a center rod having a transverse hole near itstop, a V- shaped wire passed through said hole so as to constitutedivergent supporting legs for said rod, and a clamp sliclable on saidrod and provided with means for adjust-ably carrying a marking point.

In testimony whereof I have hereunto set my hand.

WILLIAM S. OVERLIN.

